10211100100021 has 2 divisors, whose sum is σ = 10211100100022. Its totient is φ = 10211100100020.

The previous prime is 10211100100001. The next prime is 10211100100049. The reversal of 10211100100021 is 12000100111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5263651890225 + 4947448209796 = 2294265^2 + 2224286^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211100100021 - 2²⁹ = 10210563229109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10211100099980 and 10211100100007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211100100001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105550050010 + 5105550050011.

It is an arithmetic number, because the mean of its divisors is an integer number (5105550050011).

Almost surely, 2^{10211100100021} is an apocalyptic number.

It is an amenable number.

10211100100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211100100021 is an equidigital number, since it uses as much as digits as its factorization.

10211100100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 10211100100021 its reverse (12000100111201), we get a palindrome (22211200211222).

The spelling of 10211100100021 in words is "ten trillion, two hundred eleven billion, one hundred million, one hundred thousand, twenty-one".